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Check the listing for details. 80016 Circuit Breaker Finder Tool Kit Accessories GFCI Outlet Tester 2-Piece Set. Condition: New. Listed at 54.39 USD. Klein Tools 80016 Circuit Breaker Finder Tool Kit with Accessories, GFCI Outlet Tester, 2-Piece Set, Includes Cat. ET310 and Cat. GFCI OUTLET TESTING: Transmitter features a built-in GFCI outlet tester to inspect wiring conditions and test GFCI devices.